Search results for "stil"
showing 10 items of 1452 documents
Polycrystalline TiO2 impregnated with cardanol-based porphyrins for the photocatalytic degradation of 4-nitrophenol
2004
Hydrogenated cardanol (3-n-pentadecylphenol), a renewable organic resource obtained by vacuum distillation of roasted “cashew nut shell liquid” (CNSL), a by-product of the cashew industry, has been used to synthesize novel lipophilic porphyrins. Polycrystalline TiO2 impregnated with these novel “cardanol-based” porphyrins as sensitizers has been investigated in the photodegradation of 4-nitrophenol (4-NP) in aqueous suspension. The results indicated that the presence of the sensitizer enhances the photoactivity of polycrystalline bare TiO2 in the process. The activating effect was higher in the case of the Cu-complex.
HPMC-salicylate conjugates as macromolecular prodrugs: Design, characterization, and nano-rods formation
2009
The design, characterization, and nano-rods formation of hydroxypropylmethylcellulose (HPMC)-salicylate conjugates as macromolecular prodrugs, was described. HPMC, obtained from Zhejiang Zhongbao Imp and Exp Corp, was dried under vacuum at 110°C for 8 hr. Nanoparticles were prepared using dialysis process in which 170 mg of HPMC-salicylate sample was dissolved in 5 mL of purified DMSO and was dialyzed against distilled water for 4 days. HPMC-salicylic acid conjugates reveal the absence of sulfur in all of the samples showing that there is no introduction to tosylate groups either covalently bounded or as an impurity.
Influence of the polymerization step alone on oxygen affinity and cooperativity during production of hyperpolymers from native hemoglobins with cross…
1994
The aim of this study was to find out how the polymerization per se changes oxygen affinity (P50) and cooperativity (n50) of various soluble huge hyperpolymers prepared from native hemoglobins by crosslinking. Increase of cooperativity would be expected considering natural hemoglobin networks. Those hyperpolymers with molecular weights of some 10(6) g/mol are candidates for artificial oxygen-carrying blood additives rather than volume substitutes. Human and bovine hemoglobin reacted with several crosslinkers (2,5-diisothiocyanatobenzenesulfonate (DIBS); 4,4'-diisothiocyanatostilbene-2, 2'-disulfonate (DIDS); 1,3-butadiene diepoxide (BUDE); glutaraldehyde (GDA)) in concentrated (case 1) and …
Resveratrol, a polyphenolic phytoalexin present in red wine, enhances expression and activity of endothelial nitric oxide synthase.
2002
Background— Estrogens can upregulate endothelial nitric oxide synthase (eNOS) in human endothelial cells by increasing eNOS promoter activity and enhancing the binding activity of the transcription factor Sp1. Resveratrol, a polyphenolic phytoalexin found in grapes and wine, has been reported to act as an agonist at the estrogen receptor. Therefore, we tested the effect of this putative phytoestrogen on eNOS expression in human endothelial cells. Methods and Results— Incubation of human umbilical vein endothelial cells (HUVEC) and HUVEC-derived EA.hy 926 cells with resveratrol for 24 to 72 hours upregulated eNOS mRNA expression in a time- and concentration-dependent manner (up to 2.8-fold)…
Some Features of Polymeric Membranes for Water Purification via Membrane Distillation
2011
Polymeric membranes are currently adopted in water purification processes, such as reverse osmosis (RO) and membrane distillation (MD). This latter technique is very promising for separation effectiveness and energy savings. A valuable and effective MD unit must be equipped with polymeric membranes that exhibit specific properties, for example, hydrophobicity, a narrow pore size range, a high water penetration pressure, and a large vapor permeability. In this work, we present and examine the main features of membranes for MD processes, with the aim of experimentally evaluating the related performances. Scanning electron microscopy analysis was carried out for a first estimate of the pore si…
Heterogeneous contributions of change in population distribution of body mass index to change in obesity and underweight
2021
From 1985 to 2016, the prevalence of underweight decreased, and that of obesity and severe obesity increased, in most regions, with significant variation in the magnitude of these changes across regions. We investigated how much change in mean body mass index (BMI) explains changes in the prevalence of underweight, obesity, and severe obesity in different regions using data from 2896 population-based studies with 187 million participants. Changes in the prevalence of underweight and total obesity, and to a lesser extent severe obesity, are largely driven by shifts in the distribution of BMI, with smaller contributions from changes in the shape of the distribution. In East and Southeast Asia…
Når preposisjonar erstattar kasus : om preposisjonsobjekt (objektsadverbial) frå norrønt til moderne norsk
2006
Masteroppgave i Nordisk språk og litteratur 2006 - Høgskolen i Agder, Kristiansand Dette arbeidet har to hovuddelar. Den første delen er ei valensundersøking. Formålet med denne undersøkinga er å finne ut kva for valens verb som i moderne norsk krev preposisjonsobjekt, hadde på det norrøne språksteget. Den andre hovuddelen er ein analyse av preposisjonsobjekt i moderne norsk, med grunnlag i det teoretiske rammeverket i arbeidet, Lexicase Dependency Grammar (Starosta 1988). Sentrale prinsipp i Lexicase Dependency Grammar (LCDG) blir presenterte i kap. 2. I dette kapittel blir også metodiske spørsmål i samband med valensundersøkinga diskuterte, og korpusa som dannar grunnlag for undersøkingan…
Grapefruit essential oils inhibit quorum sensing of Pseudomonas aeruginosa.
2019
Citrus essential oils are used in food to confer flavor and aromas. The citrus essential oils have been granted as GRAS and could be used as antimicrobial additives to control bacterial quorum sensing from potential food bacterial pathogens. The chemical composition and inhibitory activity of Citrus paradisi (grapefruit) essential oils obtained by cold-pressed method (EOP) and cold-pressed method followed by steam distillation, against Pseudomonas aeruginosa were determined . The GC-MS analyses of the oil indicated the amount of the essential oil components was highest with D-limonene in both cases. However, the extraction method modified the chemical composition. EOP had higher amount of …
The effect of thermal drying on the contents of condensed tannins and stilbenes in Norway spruce (Picea abies [L.] Karst.) sawmill bark
2021
Norway spruce (Picea abies (L.) Karst.) bark contains marked amounts of polyphenolic compounds. Condensed tannins (CTs) and stilbenes show commercial potential as antioxidants, antimicrobials, preservatives in food and cosmetic applications, technochemical products, and pharmaceuticals. Storing of bark before the conversion process leads to substantial losses of extractives compounds. In the present study, the potential of thermal drying for maintaining extractives content was assessed based on an experiment in which bark samples were dried in convection kilns at 40, 50, 60, and 70 °C temperatures. The development of CTs and stilbene contents and CT degradation were followed for 28–34 h. CT…
Percorsi pedagogici nelle attività di prevenzione delle dipendenze patologiche
2019
La salute è un bene che va mantenuto e conservato; in tale attività, un ruolo chiave è svolto dagli interventi educativi specificamente orientati ad essa e dalla promozione di corretti stili di vita. Nel corso degli anni, la promozione della salute ha individuato nella scuola il luogo privilegiato per attuare interventi educativi in grado di produrre cambiamenti sugli atteggiamenti e sui comportamenti orientati a migliorare lo stato di benessere e prevenire comportamenti a rischio. In tal senso la scuola necessita della collaborazione con il mondo sanitario per predisporre un percorso educativo altamente consapevole e responsabile. La seconda parte del volume è infatti dedicata agli interve…